arm: fix some warnings reported by MSVC

arch/ARM/ARMInstPrinter.c

@@ -1058,7 +1058,7 @@ static void printAM3PreOrOffsetIndexOp(MCInst *MI, unsigned Op, SStream *O,
 			MI->flat_insn->detail->arm.operands[MI->flat_insn->detail->arm.op_count].mem.disp = (int)ImmOffs;
 			MI->flat_insn->detail->arm.operands[MI->flat_insn->detail->arm.op_count].subtracted = true;
 		} else
-			MI->flat_insn->detail->arm.operands[MI->flat_insn->detail->arm.op_count].mem.disp = (int)-ImmOffs;
+			MI->flat_insn->detail->arm.operands[MI->flat_insn->detail->arm.op_count].mem.disp = -(int)ImmOffs;
 	}
 
 	SStream_concat0(O, "]");

suite/arm/test_arm_regression.c

@@ -24,7 +24,7 @@ struct platform {
 	int syntax;
 };
 
-static char* hex_string(unsigned char *str, int len)
+static char *hex_string(unsigned char *str, size_t len)
 {
 	// returns a malloced string that has the hex version of the string in it
 	// null if failed to malloc
@@ -195,8 +195,8 @@ static void test_invalids()
 		cs_option(handle, CS_OPT_SYNTAX, CS_OPT_SYNTAX_NOREGNAME);
 
 		for (j = 0; j < invalid->num_invalid_codes; ++j) {
-			struct invalid_code * invalid_code = NULL;
-			char * hex_str = NULL;
+			struct invalid_code *invalid_code = NULL;
+			char *hex_str = NULL;
 
 			invalid_code = invalid->invalid_codes + j;
 
@@ -234,7 +234,7 @@ struct valid_code {
 	unsigned char *code;
 	size_t size;
 	uint32_t start_addr;
-	char* expected_out;
+	char *expected_out;
 	char *comment;
 };